LXR linux-old/fs/smbfs/symlink.c

   1/*
   2 *  symlink.c
   3 *
   4 *  Copyright (C) 2002 by John Newbigin
   5 *
   6 *  Please add a note about your changes to smbfs in the ChangeLog file.
   7 */
   8
   9#include <linux/sched.h>
  10#include <linux/kernel.h>
  11#include <linux/errno.h>
  12#include <linux/fcntl.h>
  13#include <linux/stat.h>
  14#include <linux/mm.h>
  15#include <linux/slab.h>
  16#include <linux/pagemap.h>
  17#include <linux/smp_lock.h>
  18#include <linux/net.h>
  19
  20#include <asm/uaccess.h>
  21#include <asm/system.h>
  22
  23#include <linux/smbno.h>
  24#include <linux/smb_fs.h>
  25
  26#include "smb_debug.h"
  27#include "proto.h"
  28
  29int smb_read_link(struct dentry *dentry, char *buffer, int len)
  30{
  31        char *link;
  32        int result;
  33        DEBUG1("read link buffer len = %d\n", len);
  34
  35        result = -ENOMEM;
  36        link = kmalloc(SMB_MAXNAMELEN + 1, GFP_KERNEL);
  37        if (!link)
  38                goto out;
  39
  40        result = smb_proc_read_link(server_from_dentry(dentry), dentry, link,
  41                                    SMB_MAXNAMELEN);
  42        if (result < 0)
  43                goto out_free;
  44        result = vfs_readlink(dentry, buffer, len, link);
  45
  46out_free:
  47        kfree(link);
  48out:
  49        return result;
  50}
  51
  52int smb_symlink(struct inode *dir, struct dentry *dentry, const char *oldname)
  53{
  54        DEBUG1("create symlink %s -> %s/%s\n", oldname, DENTRY_PATH(dentry));
  55
  56        smb_invalid_dir_cache(dir);
  57        return smb_proc_symlink(server_from_dentry(dentry), dentry, oldname);
  58}
  59
  60int smb_follow_link(struct dentry *dentry, struct nameidata *nd)
  61{
  62        char *link;
  63        int result;
  64
  65        DEBUG1("followlink of %s/%s\n", DENTRY_PATH(dentry));
  66
  67        result = -ENOMEM;
  68        link = kmalloc(SMB_MAXNAMELEN + 1, GFP_KERNEL);
  69        if (!link)
  70                goto out;
  71
  72        result = smb_proc_read_link(server_from_dentry(dentry), dentry, link,
  73                                    SMB_MAXNAMELEN);
  74        if (result < 0 || result >= SMB_MAXNAMELEN)
  75                goto out_free;
  76        link[result] = 0;
  77
  78        result = vfs_follow_link(nd, link);
  79
  80out_free:
  81        kfree(link);
  82out:
  83        return result;
  84}
  85
  86struct inode_operations smb_link_inode_operations =
  87{
  88        .readlink       = smb_read_link,
  89        .follow_link    = smb_follow_link,
  90};
  91